LTC4229 - Ideal Diode and Hot Swap Controller
Features
- Ideal Diode and Inrush Current Control for Redundant Supplies
- Low Loss Replacement for Power Schottky Diode
- Protects Output Voltage from Input Brownouts
- Allows Safe Hot Swapping from a Live Backplane
- 2.9V to 18V Operating Range
- Controls Back-to-Back N-Channel MOSFETs
- Limits Peak Fault Current in ≤1μs
- Adjustable Current Limit with Foldback
- Adjustable Start-Up and Current Limit Fault Delay
- 0.5μs Ideal Diode Turn-On and Turn-Off Time
- Undervoltage and Overvoltage Protection
- Status, Fault and Power Good Outputs
- Pin Selectable Latch Off or Automatic Retry After Fault
- 24-Lead 4mm × 5mm QFN and SSOP Packages
Typical Application
Description
The LTC®4229 offers ideal diode and Hot Swap™ functions for a power rail by controlling two external N-channel MOSFETs. The MOSFET acting as an ideal diode replaces a high power Schottky diode and the associated heat sink, saving power and board area. The Hot Swap MOSFET control allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a fast acting foldback current limit and electronic circuit breaker.
The LTC4229 regulates the forward voltage drop across the external MOSFET to ensure smooth current transfer in diode-OR applications. The ideal diode turns on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.
The LTC4229 provides adjustable start-up delay, undervoltage and overvoltage protection, and reports fault and power good status for the supply. It can be configured for latch off or automatic retry after a fault.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4229CG#PBF | SSOP-24 | G | C | 05-08-1640 (G24) | Yes |
| LTC4229CG#TRPBF | SSOP-24 | G | C | 05-08-1640 (G24) | Yes |
| LTC4229CUFD#PBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4229CUFD#TRPBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4229IG#PBF | SSOP-24 | G | I | 05-08-1640 (G24) | Yes |
| LTC4229IG#TRPBF | SSOP-24 | G | I | 05-08-1640 (G24) | Yes |
| LTC4229IUFD#PBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC4229IUFD#TRPBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4229CG#PBF | SSOP-24 | C | $4.21 | $2.95 | Yes | |
| LTC4229CG#TRPBF | SSOP-24 | C | $3.01 | Yes | ||
| LTC4229CUFD#PBF | 4x5 QFN-24 | C | $4.21 | $2.95 | Yes | |
| LTC4229CUFD#TRPBF | 4x5 QFN-24 | C | $3.01 | Yes | ||
| LTC4229IG#PBF | SSOP-24 | I | $4.64 | $3.25 | Yes | |
| LTC4229IG#TRPBF | SSOP-24 | I | $3.31 | Yes | ||
| LTC4229IUFD#PBF | 4x5 QFN-24 | I | $4.64 | $3.25 | Yes | |
| LTC4229IUFD#TRPBF | 4x5 QFN-24 | I | $3.31 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2060A | LTC4229IUFD Demo Board: Single Ideal Diode and Hot Swap Controller | $75.00 | |
| Buy Now | |||
Applications
- Redundant Power Supplies
- Supply Holdup
- High Availability Systems and Servers
- Telecom and Network Infrastructure
- Power Prioritizer
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC4229
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
